ammonites
Dalton Well Dinosaur Track Site (Morrison Formation) (Jurassic of the United States)

Also known as Arches National Park survey L-GFE-94-64

Where: Grand County, Utah (38.7° N, 109.7° W: paleocoordinates 34.6° N, 55.9° W)

• outcrop-level geographic resolution

When: Brushy Basin Member (Morrison Formation), Late/Upper Jurassic (161.2 - 145.5 Ma)

• "The tracks occur at or near the top of the lower Brushy Basin Member in the uppermost of the most prominent sandstone layers within this unit."

• bed-level stratigraphic resolution

Environment/lithology: "channel"; bioturbated sandstone and mudstone

• "These beds probably represent recurring sequences of channel and overbank deposits."
• "The lower Brushy Basin Member...is characterized by red, non-smectitic mudstones and siltstones [approx. 2 m thick] with laterally discontinuous [ledge-forming] sandstones that are seldom greater than, and usually less than one meter in thickness."

Size class: macrofossils

Preservation: cast, trace

Primary reference: G. F. Engelmann and S. T. Hasiotis. 1999. Deep dinosaur tracks in the Morrison Formation; sole marks that are really sole marks . Utah Geological Survey Miscellaneous Publication 99-1:179-183 [J. Alroy/R. Whatley/R. Whatley] more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 13275: authorized by John Alroy, entered by Robin Whatley on 12.02.2002

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)

Dalton Well Dinosaur Track Site (Morrison Formation): Late/Upper Jurassic, Utah

Where & when
Geology
Taphonomy & methods
Metadata & references
Geography
Country:United States State/province:Utah County:Grand
Coordinates: 38.7° North, 109.7° West (view map)
Paleocoordinates:34.6° North, 55.9° West
Geographic resolution:outcrop
Time
Period:Jurassic Epoch:Late/Upper Jurassic
Key time interval:Late/Upper Jurassic
Age range of interval:161.2 - 145.5 m.y. ago
Stratigraphy
Formation:Morrison Member:Brushy Basin
Stratigraphic resolution:bed
Stratigraphy comments: "The tracks occur at or near the top of the lower Brushy Basin Member in the uppermost of the most prominent sandstone layers within this unit."
Lithology and environment
Primary lithology:deformed bedding,bioturbation sandstone
Secondary lithology:desiccation cracks mudstone
Includes fossils?Y
Lithology description: "The lower Brushy Basin Member...is characterized by red, non-smectitic mudstones and siltstones [approx. 2 m thick] with laterally discontinuous [ledge-forming] sandstones that are seldom greater than, and usually less than one meter in thickness."
Environment:"channel"
Geology comments: "These beds probably represent recurring sequences of channel and overbank deposits."
Taphonomy
Modes of preservation:cast,trace
Size of fossils:macrofossils
Spatial orientation:life position
Preservation of anatomical detail:variable
Temporal resolution:snapshot
Collection methods and comments
Collection methods:observed (not collected)
Reason for describing collection:taphonomic analysis
Metadata
Also known as:Arches National Park survey L-GFE-94-64
Database number:13275
Authorizer:J. Alroy Enterer:R. Whatley
Modifier:R. Whatley Research group:vertebrate
Created:2002-02-12 18:22:53 Last modified:2004-04-06 10:10:50
Access level:the public Released:2002-02-12 18:22:53
Creative Commons license:CC BY-NC-ND
Reference information
Primary reference:
44035% 1060G. F. Engelmann and S. T. Hasiotis. 1999. Deep dinosaur tracks in the Morrison Formation; sole marks that are really sole marks . Utah Geological Survey Miscellaneous Publication 99-1:179-183 [J. Alroy/R. Whatley/R. Whatley]